I'm looking for an economical servicenow module which does this

[fastcode]

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In SERVICENOW, I wish to give many normal users (non chargeable users) the ability to add a form response

The form response needs to add a new database record -can be any servicenow module -please advise which module will be best suited for maintaining database records? any inventory module? or assets module or service requests module ? etc

The form fields contain the usual drop down, radio buttons, text areas etc

Later on the same normal users should be able to edit their own form responses or if not possible they can submit new responses or even comments to the original request and these new responses/comments must edit the SAME database record created above.
Please note even the comment posting form should contain the SAME form fields as the main form. (Is this possible?)

Which would be the cheapest module ServiceNow module available for the above use case? How much should we pay per normal user for that module? By cheapest I mean the module where the end users are charged the lowest? or a module where the pricing is not dependent on the number of end users using it?

Also the database record which gets created above needs to be versioned. i.e each edit to the record should be saved separately, so if the admin or user desires they should be able to go back to their older record versions

can this is be accomplished using some custom flow or custom application if the functionality is not present by default? I would really prefer at least most of the above functionality if not all being present by default in your recommended module

If I could accomplish the above that would be my short term goal 

Future goal:

Also as a next step what I would like to do is to create triggers or some automatic flow whenever the particular database record gets created or edited to call some external APIs like azure cloud or aws cloud etc to provision resources based on the particular database record. I'm mentioning this point since this is my end goal

THANKS a lot

PS: I'm open for using 3rd party commercial apps/modules too